CN202982316U - Self-expanding type knitted tube bracket - Google Patents
Self-expanding type knitted tube bracket Download PDFInfo
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- CN202982316U CN202982316U CN 201220586274 CN201220586274U CN202982316U CN 202982316 U CN202982316 U CN 202982316U CN 201220586274 CN201220586274 CN 201220586274 CN 201220586274 U CN201220586274 U CN 201220586274U CN 202982316 U CN202982316 U CN 202982316U
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- braiding
- crosslinking points
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Abstract
The utility model relates to a self-expanding type knitted tube bracket which comprises a tube-shaped gridding. The tube-shaped gridding is formed by circumferentially connecting a plurality of wave bands, each of the wave bands is composed of a plurality of axial wave peaks and wave troughs of spring wires, each of bands is connected with another band, parellelly adjacent wave bands are arranged on two sides of each wave band respectively, at least one cross-linked point is arranged between each two parellelly adjacent wave bands, each cross-linked point is formed by the fact that one peak trough on one of the wave bands which are parellelly adjacent penetrates through one corresponding wave peak on another wave band, at least part of the cross-linked points are fixed, each of the wave bands is further overlapped with another at least one wave band, a plurality of cross points are formed among the overlapped wave bands, each of the wave bands and another at least one wave band form a group of parallel wave bands, the group of parallel wave bands have similar wave forms, and cross-linked points or cross points cannot be formed among the parallel wave bands.
Description
Technical field
This utility model relates to a kind of medical apparatus and instruments for supporting or repair body lumen, relates in particular to a kind of self-inflated intraluminal stent and manufacture method of the braiding for the narrow or inaccessible intracavity interventional therapy of arteries.
Background technology
Body lumen comprises arteries, vein blood vessel, trachea, bronchus, esophagus, biliary tract, urethra etc., and diameter does not wait from several millimeters to tens millimeters.Various pathological changes may appear in these body lumens, for example collapse, inaccessible, damaged, and corresponding intraluminal stent can be used for treating these tube chamber pathological changes.These intraluminal stents should satisfy some general character requirements, such as, can be loaded in tiny sheath pipe, deliver in body lumen and be released again, just be supported on predetermined tube chamber position after expansion, realize therapeutic effect.
Because arteries than other body lumen, pathological changes occurs more easily, intraluminal stent is most commonly used to treat the arteries pathological changes.Arteries is divided into a variety of, and the peripheral arterial blood vessel is the typical case particularly, mainly comprises carotid artery, subclavian artery, artery of lower extremity, renal artery etc.Stricture of artery or the inaccessible cause of disease mainly contain atherosclerosis, Takayasu arteritis and fibromuscular dysplasia etc.In western countries, approximately to become be by due to atherosclerosis to 90% stricture of artery sexually transmitted disease (STD), in Chinese Takayasu arteritis be also stricture of artery commonly encountered diseases because of.
Carotid artery stenosis can cause the ischemia symptom of head and eye, as dizzy, have a headache, faint, disposable black Mongolian, the symptom such as blind.The Subclavian artery occlusion sudden onset shows as and suffers from limb burst pain, and the skin temperature drop is low, and the colour of skin changes, acral necrosis even when serious; Subclavian artery stenosis often shows as suffers from myasthenia of limbs, numbness, cold, movable rear intermittent limbs pain.Renal artery stenosis easily causes the renal artery functional defect.The arterial occlusions in lower limbs sudden onset can cause and suffer from limb burst pain, and the skin temperature drop is low, and the colour of skin changes, and begin palely, and acral necrosis even occurs in the time of seriously; Lower Extremity Artery Stenosis often shows suffers from myasthenia of limbs, numbness, cold, movable rear intermittent limbs pain.
Mainly contain following several therapeutic modality for stricture of artery at present:
When pathological changes tremulous pulse mild stenosis or patient clinical non-evident sympton, can take internal medicine treatment, but for patient's DeGrain of serious symptom.The doctor can formulate therapeutic scheme for patient's situation, comprises the medicine of transferring fat and blood pressure lowering.Some patient may also can need to reduce blood thrombosed danger in artery stenosis with anticoagulant.
Stricture of artery is serious or entirely shut, and can select surgical operation therapy.For the arteries of diameter 4-18 millimeter, it is artery bypass that methods of surgical is mainly by-pass operation, namely walks around the narrow artery segment of pathological changes, uses a new road to connect the normal blood vessel in its two ends.But surgery operating wound is large, and complication is high.
The tremulous pulse thrombolytic, get bolt treatment, be fit to acute arteria iliacofemoralis thrombosis or Patients with Embolization, but for chronic angiostenosis Occlusion and improper.
For the endoluminal vascular plasty, at first Dotter in 1964 and Judkins adopt coaxial nylon balloons dilating catheter percutaneous vasodilation art, have from then on pulled open the prelude of balloon expandable intracavity forming operation (PTA).Along with the development of intracavity technology, minimally-invasive treatment just more and more is employed.The endoluminal vascular plasty is different from traditional modus operandi, has less wound and reaches post-operative recovery faster, becomes stricture of artery or inaccessible a kind of primary treatment mode.
The endoluminal vascular plasty mainly contains two kinds at present, and a kind of is balloon expandable Endovascular plasty (PTA), and another kind is stent endoprosthesis.Balloon expandable Endovascular plasty refers to utilize sacculus that lesion vessels is expanded, to reach the purpose of dredging vascellum.But the short run effect after balloon expandable Endovascular plasty is apparent in view, but complication rate is higher, and main complication is that speckle or thrombosis come off and cause the distal vessels thromboembolism, and after the operation, the incidence rate of vascular restenosis is also very high in addition.Stent refers to that support is opened lesion locations vasodilation at lesion vessels position implantable intravascular support, and there is certain radial support power in support after implanting, and this has reduced the possibility of vascular restenosis.Be fit at present peripheral vascular support and mainly contain two kinds, ball expands support and from swollen support.Ball expands support and refers to utilize sacculus that support is expanded, support keeps certain radial support power because of plastic deformation, this support is less thereby accurate positioning by the axial cripetura rate after expanding, but its compliance is relatively poor, be only suitable for being placed on the blood vessel at straight place, and the incidence rate of restenosis is relatively also higher from swollen support.Refer to that from swollen support support discharges rear super-elasticity and shape memory characteristic by self in the sheath pipe, can arrive original shape by automatic rebounding.Be widely used because of its good performance and few complication from swollen support, expand support than ball and be more suitable for limb vessel in frequent curvature movement.In prior art, be fit to peripheral vascular self-inflated intraluminal stent and mostly adopt the NiTi pipe to form through laser engraving, a small amount of employing nitinol alloy wire braiding forms.
The self-inflated intraluminal stent mainly take the laser engraving support as main, namely carries out laser engraving to the Nitinol pipe, and forms by heat treatment shaping at present.Adopt the compliance of the self-inflated intraluminal stent that this mode makes not good, the ratio that fatigue fracture occurs is higher, should not be used for body lumen position more crooked and that have certain activeness.The self-inflated intraluminal stent also has the braiding of employing titanium-nickel wire to form, and the self-inflated intraluminal stent of titanium-nickel wire braiding has extraordinary compliance and anti-fatigue performance, is fit to very much be placed on the crooked lesion locations of the body lumen with certain activeness.But the axial cripetura rate of the self-inflated intraluminal stent of braiding of the prior art is very high, that is to say, originally after being compressed in intraluminal stent in the sheath pipe and discharging in the sheath pipe, very large cripetura occurs in the length after the intraluminal stent automatic expansion, this cripetura meeting causes the location difficulty of support in dispose procedure and is wayward, the radial support power of support reduces, and support easily is shifted.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of self-inflated intraluminal stent of braiding, excessive with the cripetura rate of the braided support that solves prior art and the radial support power location difficulty that causes, support is little, the problems of easy generation displacement, the problem of fatigue fracture easily occurs in the intraluminal stent of also having avoided laser engraving commonly used in the body lumen position of various tortuous and certain activeness.
solving the technical scheme that technical problem of the present utility model adopts is: the self-inflated intraluminal stent that a kind of braiding is provided, described intraluminal stent has the tubulose grid that is connected to form at circumferencial direction by a plurality of axial wave bands, described tubulose grid comprises axis, near-end and far-end, described each wave band alternately is comprised of a plurality of crests and a plurality of trough of elastic yarn in axially coiling, the near-end of each wave band and far-end connect respectively another wave band, there is respectively a wave band of adjacency side by side the both sides of each wave band, every two have at least one crosslinking points between the wave band of adjacency side by side, described each crosslinking points passes a corresponding crest on another wave band wherein by a trough on one of them wave band of two wave bands of described adjacency side by side and intersects and form, and at least a portion among described crosslinking points is fixing crosslinking points, each wave band also is overlapping with other at least one wave band, form a plurality of cross points between the described wave band that is overlapping, each wave band also consists of one group of parallel wave band with other at least one wave band, and described one group of parallel wave band has similar waveform and is parallel to each other trend and can not form crosslinking points or cross point between described parallel wave band.
As further improvement of the utility model, described tubulose grid comprises a plurality of intersection sections that connect vertically, described each intersection section is for tubulose and comprise roughly equally distributed a plurality of cross point, only on the demarcation line of adjacent two intersection sections, described demarcation line is closed loop to described crosslinking points.
As further improvement of the utility model, nk-1 crosslinking points arranged respectively on described each demarcation line, perhaps on described each demarcation line, nk+1 crosslinking points arranged respectively, wherein, n and k are natural numbers, n 〉=3 and k 〉=2.
As further improvement of the utility model, described each to intersect the number in the cross point on section be roughly the integral multiple of the number of the crosslinking points on described each demarcation line, described two number purpose ratios with the most close Galois extension value less than 0.2.
As further improvement of the utility model, the crosslinking points on described demarcation line is all fixing crosslinking points.
As further improvement of the utility model, described each zone of intersection segment length equates.
As further improvement of the utility model, the length of a described intersection section is the integral multiple of the length of described another intersection section.
As further improvement of the utility model, the diameter of described tubulose grid changes vertically.
As further improvement of the utility model, described tubulose grid comprises different at least two sections of the diameter that links together vertically, each section of tubulose grid comprises a plurality of wave bands, between the wave band of the wherein wave band of a section of tubulose grid and another section of tubulose grid, crosslinking points is arranged.
Compared with prior art, this utility model possesses following advantage: the self-inflated intraluminal stent of this utility model braiding, adopted axial wave band, the intrinsic advantage that has kept the intraluminal stent of closed loop braiding, for example, can realize resetting, namely support can be regained the sheath pipe again after discharging a part, and release is again carried out in adjusted position postpone; On the other hand, not only reduced the cripetura rate, when discharging, support is difficult for being shifted, registration is easily controlled, and compliance and axial strength have been improved, can bear larger angle of bend and not give a discount and also do not lose radial support power, therefore can implant various tortuous body lumen diseased regions.Fixedly crosslinking points is distributed on circumference, guaranteed the radial support intensity of intraluminal stent, and crossover points distributed is conducive to improve the compliance of intraluminal stent at different intersection sections.Fixedly crosslinking points is distributed on the demarcation line of adjacent intersection section, the cross point and fixedly crosslinking points form alternating, complementary, and the cross point is more than fixing crosslinking points, increased mesh-density, therefore structural stability is better, can increase the covering power to the arteriosclerosis plate, allows the suitable distortion of tubulose grid, Uniform Dispersion stress and frictional force are taken into account cripetura rate, compliance and radial support intensity.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in accompanying drawing:
Fig. 1 is the axonometric chart of the intraluminal stent of making this utility model embodiment one mould used.
Fig. 2 is the schematic diagram after the outer circumference surface of the mould in Fig. 1 is unfolded.
Fig. 3 is the schematic diagram of the first wave band of first group of grid of the intraluminal stent of braiding this utility model embodiment one.
Fig. 4 is the schematic diagram of the second wave band of first group of grid of the intraluminal stent of braiding this utility model embodiment one.
Fig. 5 intersects at the enlarged diagram that mutually is fastened of hanging near the titanium-nickel wire of screw mandrel.
Fig. 6 is the schematic diagram after first group of grid braiding of the intraluminal stent of this utility model embodiment one completed.
Fig. 7 is the schematic diagram of second group of grid of intraluminal stent of this utility model embodiment one of taking up one's knitting.
Fig. 8 is that schematic diagram is afterwards completed in first group of grid and second group of grid braiding of the intraluminal stent of this utility model embodiment one.
Fig. 9 is the schematic diagram of intraluminal stent after braiding is completed of this utility model embodiment one.
Figure 10 is the schematic diagram after the outer circumference surface of the intraluminal stent of making this utility model embodiment two mould used is unfolded.
Figure 11 is the schematic diagram of the first wave band of first group of grid of the intraluminal stent of braiding this utility model embodiment two.
Figure 12 is the schematic diagram of the second wave band of first group of grid of the intraluminal stent of braiding this utility model embodiment two.
Figure 13 is the schematic diagram of first group of grid after completing braiding of the intraluminal stent of this utility model embodiment two.
Figure 14 is the schematic diagram of second group of grid of intraluminal stent of this utility model embodiment two of taking up one's knitting.
Figure 15 is first group of grid and the schematic diagram of second group of grid after completing braiding of the intraluminal stent of this utility model embodiment two.
Figure 16 is the schematic diagram of intraluminal stent after completing braiding of this utility model embodiment two.
Figure 17 is the schematic diagram after the outer circumference surface of the intraluminal stent of making this utility model embodiment three mould used is unfolded.
Figure 18 is the schematic diagram of head section of intraluminal stent of this utility model embodiment three of taking up one's knitting.
Figure 19 is the schematic diagram after the head section braiding of the intraluminal stent of this utility model embodiment three is completed.
Figure 20 is the schematic diagram of rear of intraluminal stent of this utility model embodiment three of taking up one's knitting.
Figure 21 is the schematic diagram of intraluminal stent after completing braiding of this utility model embodiment three.
Figure 22 is one of them fixing schematic diagram of crosslinking points and a revocable crosslinking points of the intraluminal stent of this utility model embodiment four.
Figure 23 is the schematic diagram of the intraluminal stent of this utility model embodiment four, and its tubulose grid comprises fixedly crosslinking points and revocable crosslinking points.
The specific embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining this utility model, and be not used in restriction this utility model.
this utility model provides a kind of self-inflated intraluminal stent of braiding, this intraluminal stent comprises the tubulose grid that is connected to form at circumferencial direction by a plurality of axial wave bands, this tubulose grid has axis, near-end and far-end, each wave band alternately is comprised of a plurality of crests and a plurality of trough of elastic yarn in axially coiling, the near-end of each wave band and far-end connect respectively another wave band, there is respectively a wave band of adjacency side by side the both sides of each wave band, every two have at least one crosslinking points between the wave band of adjacency side by side, each crosslinking points by this side by side a trough on one of them wave band of adjacency pass a corresponding crest on another wave band wherein and intersect and form, and at least a portion among this crosslinking points be fixedly crosslinking points (through any fixedly crosslinking points braided wires this fixedly the crosslinking points place be fastened can not mutually move together), each wave band also is overlapping with other at least one wave band, form a plurality of cross points (braided wires through any cross point is intersected and can mutually move at this place, cross point) between this wave band that is overlapping, each wave band also consists of one group of parallel wave band with other at least one wave band, and this group of parallel wave band has similar waveform and is parallel to each other trend and can not form crosslinking points or cross point between this parallel wave band.
Along a plurality of circumference, the extension screw mandrel is set on the sidewall of cylindrical die, adjacent two rows hang screw mandrel and are staggered, knit out the tubulose grid with elastic yarn (as nitinol alloy wire) at the circumferential surface of mould rod, titanium-nickel wire is walked around a series of extension screw mandrel by predetermined order, so that the feature of tubulose grid meets predetermined requirement.Along cylinder axis to weave first wave band around " it " word between the extension screw mandrel, wave band is waveform, and each axial wave band comprises a plurality of crests and a plurality of trough that alternately connects; After the braiding of first wave band is completed, with nitinol alloy wire from opposite axial continuation around second wave band of " it " word braiding, the number of second contained crest of wave band equates with the number of the contained trough of first wave band, vice versa; When the trough (crest) of the crest (trough) on second wave band and the correspondence position of first wave band intersects, the titanium-nickel wire that the titanium-nickel wire that crest (trough) on second wave band is located and the trough (crest) on first wave band are located is wound around and is woven together, and other step of the weaving method of second wave band is identical with first wave band; Complete the braiding of all the other wave bands according to above method.In the braiding process, when titanium-nickel wire was crossing with the titanium-nickel wire of the wave band that weaves before, two titanium-nickel wires formed a cross point or a crosslinking points herein.Do not change original trend separately if two titanium-nickel wires just intersect, formed the cross point, the titanium-nickel wire in the cross point can move mutually.If two titanium-nickel wires bend herein and are hooked on together, and two titanium-nickel wires have all changed original trend separately, that is to say a crest to pass a trough and snapping has formed crosslinking points, crest and trough at the crosslinking points place are coupled in couples and can not be freed.If two titanium-nickel wires at crosslinking points place also are intertwined mutually, formed fixedly crosslinking points, two titanium-nickel wires at fixing crosslinking points place can not move mutually.If titanium-nickel wire is continuously through a plurality of cross points, and the top in a cross point therein, this root titanium-nickel wire just preferably (is namely passing above the root titanium-nickel wire from another) above adjacent cross point, so repeatedly.Support after braiding is completed preferably passes through high-temperature shaping again, then takes off the tubulose grid from mould, has just obtained intraluminal stent.
This support adopts elastic yarn, as nitinol alloy wire, be made to be different from support weaving method of the prior art, has very low axial cripetura rate, therefore the dispose procedure of this support safety is controlled, accurate positioning guarantees enough radial support power simultaneously, has also kept extraordinary compliance and anti-fatigue performance.
Below illustrate the aspects such as intraluminal stent concrete structure of the present utility model and making by a plurality of embodiment.
Embodiment one
Fig. 1 is for making the needed mould of this intraluminal stent, this mould is by forming with the mould rod 1 of circular hole and the extension screw mandrel 2 of insertion circular hole, mould rod 1 has eight circular holes at the every circle of sidewall circumferencial direction, the azimuth of the circular hole on adjacent two circumference is staggered, and each is hung screw mandrel 2 and is separately fixed on a circular hole of mould rod 1.Fig. 2 is the schematic diagram of the side surface of mould rod 1 shown in Figure 1 when being launched into the plane, hangs screw mandrel 2 and distributes along even circumferential, and each circumference is launched into straight line, and this mould is axially having ten circumference, and the distance between adjacent circumferential is identical.Although this mould has ten circumference, as required, the quantity of the circumference on mould can reduce to four, and circumference quantity also can more than ten, and the distance between circumference can be different.For the ease of describing in detail, after the side surface of the mould rod 1 in Fig. 2 was unfolded, two extension screw mandrels 2 at the two ends of same circumference repeated to show, actual these two is same extension screw mandrel 2, and this is because hang the periodic arrangement of screw mandrel 2 on circumference.As shown in Figure 2, eight extension screw mandrels 2 have been arranged on each circumference.In the present embodiment, the extension screw mandrel on each circumference can be also ten, so also can realize the more uniform support of support force.Universal law is, the extension screw mandrel number on each circumference is nk-1 or nk+1, and wherein, n and k are natural numbers, n 〉=3 and k 〉=2.That is to say, the present embodiment has adopted n=3 and k=3.When n=3 and k=2, the extension screw mandrel number on each circumference is five or seven, and the grid of this kind support is more sparse.When n=4 and k=3, the extension screw mandrel number on each circumference is 11 or 13, and the grid of this kind support is closeer, the support that suitable diameter is larger.When k is odd number, extension screw mandrel on adjacent two circumference staggers and is advisable, and preferably, the extension screw mandrel on circumference faces the mid point of line between two adjacent extension screw mandrels on an adjacent circumference, can make like this open weave more even, the present embodiment namely so.When k was even number, the extension screw mandrel on adjacent two circumference was preferably aimed at mutually, is arranged in matrix, so that weave mesh is even.The present embodiment one employing diameter is the titanium-nickel wire braiding of 0.05 inch, also can replace with the braided wires of other material, as stainless steel silk.Because the present embodiment adopts n=3, need to weave respectively three groups of grids.as shown in Figure 3, at first weave first group of grid, (crest is the highest summit of wave band to weave vertically first group of crest of first wave band and trough since the extension screw mandrel 3 of the first circumference 41, trough is the minimum summit of wave band), position around the extension screw mandrel 4 to the second circumference 42 forms a crest, and then form a trough around the position of the extension screw mandrel 5 to the 3rd circumference 43, complete the braiding of first group of crest of first wave band and trough, according to above method axially with titanium-nickel wire along the "the" shape path through the 3rd circumference 44 and the 4th circumference 45, form second group of crest and trough, again through the 5th circumference 46 and the 6th circumference 47, form the 3rd group of crest and trough, again through the 7th circumference 48 and the 8th circumference 49, form the 4th group of crest and trough.Braided wires finishes the axially braiding of first wave band around hang the position of screw mandrel 8 to the tenth circumference 50.Crest and trough alternative arrangement on wave band, crest are all in the same side of this wave band, and trough all at the opposite side of this wave band, for example, in the first wave band, forms crest in the position that hangs screw mandrel 4 and 8, forms trough in the position that hangs screw mandrel 5 and 6.
As shown in Figure 4, from hanging screw mandrel 8, titanium-nickel wire is begun the braiding of first group of crest of the second wave band and trough around the position to extension screw mandrel 9, the crest that a trough of the second wave band passes the first wave band intersects in the position that hangs screw mandrel 7, and the titanium-nickel wire that intersects is fastened together mutually in the position that hangs screw mandrel 7, form a fixedly crosslinking points, braided wires herein is fixed together and can not mutually moves.Fig. 5 intersects at the schematic diagram that mutually is fastened of hanging near the titanium-nickel wire of screw mandrel 7, after titanium-nickel wire intersects all deviation direction, with separately original trend in an angle, in order to form uniform grid, preferred angle is between 60 ° to 120 ° and be consistent.Complete other crest of the second wave band and the braiding of trough according to identical method, titanium-nickel wire arrives the position of the extension screw mandrel 10 of the first circumference 41, the trough of the second wave band overlaps to form fixedly crosslinking points with the crest of the first wave band respectively, and the titanium-nickel wire at place, lap position is intertwined mutually.Because the present embodiment selection k=3 on the first circumference 41, apart from 3 times that are adjacent extension screw mandrel spacing, that is to say between extension screw mandrel 3 and extension screw mandrel 10, also keep the use temporarily of two extension screw mandrels between extension screw mandrel 3 and extension screw mandrel 10.Begin the braiding of triband from the position that hangs screw mandrel 10, and complete by the same way the braiding of the 3rd, the 4th, the 5th wave band, titanium-nickel wire arrives the position of the extension screw mandrel 11 of the tenth circumference 50, consists of first group of grid, as shown in Figure 6.
As shown in Figure 7, the second group of grid that take up one's knitting from hanging the braiding of screw mandrel 11 beginning the 6th wave bands, forms the first cross point 12 of the 6th wave band and the first wave band near extension screw mandrel 11.Intersect herein and do not change original trend and can mutually move through the braided wires in cross point, that is to say, position in the first cross point 12, the titanium-nickel wire of the 6th wave band intersects with the titanium-nickel wire of the first wave band for the first time, the 6th wave band titanium-nickel wire is walked around above the first wave band titanium-nickel wire, and the titanium-nickel wire of the titanium-nickel wire of the 6th wave band and the first wave band can move near the first cross point 12 mutually.Then titanium-nickel wire is walked around the extension screw mandrel 13 of the 9th circumference 49, near formation the second cross point 14 extension screw mandrel 13.That is to say, the position in the second cross point 14, the titanium-nickel wire of the 6th wave band intersects with the titanium-nickel wire of the first wave band for the second time, and passes from the below of the first wave band titanium-nickel wire.Continue to repeat this step, the titanium-nickel wire of the 6th wave band repeatedly intersects with the titanium-nickel wire of the second wave band again, and alternately stride across from the titanium-nickel wire above and below of the second wave band, then the titanium-nickel wire of the 6th wave band arrives the extension screw mandrel 15 of the first circumference 41, completes the braiding of the 6th wave band according to above method.As seen, the 6th wave band and the first wave band interweave, and both extend in identical plane domain; The 6th wave band has similar shape to the second wave band, and both extend in parallel and keep certain distance.On the first circumference 41, hang screw mandrel 3 adjacent with extension screw mandrel 15, use temporarily and also keep an extension screw mandrel between extension screw mandrel 15 and extension screw mandrel 10.
From hanging the braiding of screw mandrel 15 beginning the 7th wave bands, the titanium-nickel wire of the 7th wave band also repeatedly intersects and alternately strides across the titanium-nickel wire of the second wave band from the above and below, interweaves with the second wave band.And complete the braiding of the 7th wave band, the 8th wave band, the 9th wave band, the tenth wave band according to above method, as shown in Figure 8.Similarly, the corresponding crest of the trough of the 7th wave band and the 6th wave band is wound around and is hinged, the corresponding crest of the trough of the 8th wave band and the 7th wave band is wound around hinged, the like, the 6th wave band, the 7th wave band, the 8th wave band, the 9th wave band, the tenth wave band connect into second group of grid.At this moment, have ten wave band covers and be woven in together, make first group of grid and second group of grid mutually overlapping.Hanging the position of screw mandrel 16, is also that the tenth wave band stops part.On the first circumference 41, hang screw mandrel 3 and hang screw mandrel 15 and hanging between screw mandrel 16.
As shown in Figure 9, the 3rd group of grid takes up one's knitting, begin the braiding of the 11 wave band from the position that hangs screw mandrel 16, and complete the braiding of the 11 wave band, the 12 wave band, the tenth triband, the 14 wave band, the 15 wave band, the 16 wave band according to above method.Hanging the position of screw mandrel 3, is the terminal point of the 16 wave band, is also the starting point of the first wave band.The titanium-nickel wire braiding that begins titanium-nickel wire that the 16 wave band afterbody is extended out and the first wave band from the position that hangs screw mandrel 3 is fastened together, consists of the 3rd group of closed grid, the braiding of the whole support of end.Therefore, the number of wave band is the twice of hanging the number of screw mandrel just, and these wave bands consist of respectively three groups of grids and overlap on together, consists of the even and intensive support of grid.
Preferably, the tubulose grid of intraluminal stent comprises a plurality of intersection sections that connect vertically, and each intersection section is tubulose, and the demarcation line of an annular closed is arranged between adjacent two intersection sections.Preferably, the mesh point of each intersection section is the cross point, because near the braided wires the cross point can move mutually, even the cross point comparatively dense also makes the intersection section have compliance preferably.Crosslinking points all is distributed on the demarcation line that intersects between section, and nk-1 or nk+1 crosslinking points are arranged respectively on each demarcation line, and wherein, n and k are natural numbers, n 〉=3 and k 〉=2.Preferably, the crosslinking points on the demarcation line is all fixing crosslinking points, this moment marginal closed-loop structure and fixedly crosslinking points can produce larger radial support power.Preferably, the number in the cross point on each intersection section is roughly the integral multiple of the number of the crosslinking points on each demarcation line.Due to a lot of cross points and fixedly crosslinking points can be evenly distributed in the zone that replaces of tubulose grid, such intraluminal stent has many-sided better performance concurrently, as axially cripetura rate, radial support intensity and compliance.
Above-mentioned intraluminal stent after braiding is completed, is preferably done heat treatment together with mould, at last this support is taken off from mould.Intraluminal stent for the titanium-nickel wire braiding by suitable heat treatment, makes it have super-elasticity.
Embodiment two
Figure 10 is launched into the schematic diagram on plane for making the die needed side surface of this support, also adopt parameter n=3 and k=3.Different from Fig. 2, the extension screw mandrel 2 on this mould is arranged in respectively on eight circumference, still arranges eight extension screw mandrels 2 on each circumference, and the extension screw mandrel 2 on adjacent two circumference is staggered.Distance between the first circumference 51 of one end and the second circumference 52 equals distance between the 7th circumference 57 of the other end and the 8th circumference 58, and the axial distance between remaining adjacent two circumference is the twice of the axial distance between the adjacent circumferential of two, two ends.For example, between the second circumference 52 and the 3rd circumference 53, between the 4th circumference 54 and the 5th circumference 55, between the 6th circumference 56 and the 7th circumference 57, its distance equates.
It is the titanium-nickel wire braiding of 0.05 inch that the present embodiment two also adopts diameter, forms three groups of grids that are connected, and is interwoven by 16 wave bands.As shown in figure 11, at first weave vertically first group of crest and the trough of first wave band since the extension screw mandrel 17 of the first circumference 51, position around the extension screw mandrel 18 to the second circumference 52, and then around the position of the extension screw mandrel 19 to the 3rd circumference 53, complete the braiding of first group of crest of first wave band and trough, according to above method axially with titanium-nickel wire along the "the" shape path around hang the position of screw mandrel 20 to the 8th circumference 58, finish the axially braiding of first wave band.Titanium-nickel wire in the present embodiment is hung respectively the bending angle at screw mandrel place at each, the titanium-nickel wire that is substantially equal in Fig. 3 is hung the bending angle at screw mandrel place accordingly, but, increase than the distance between circumference 51 and circumference 52 due to the distance between circumference 52 and circumference 53 and be twice, titanium-nickel wire is hung screw mandrel 18 and is being hung length between screw mandrel 19 and also hang screw mandrel 17 than it and double with length between extension screw mandrel 18.That is to say, the distance according to braided wires strides across between adjacent extension screw mandrel is divided into support a plurality of intersection sections that are connected, between two adjacent circumferential apart from having determined that therebetween one intersects the length of section.Wherein, knit out a shorter intersection section of intraluminal stent one end by the extension screw mandrel on circumference 51 and circumference 52, by circumference 52 and extension screw mandrel between circumference 57 knit out five of intraluminal stent middle part long intersect section, knit out a shorter intersection section of the intraluminal stent other end by the extension screw mandrel on circumference 57 and circumference 58.The spacing of the adjacent extension screw mandrel on the same circumference is as long measure, the extension screw mandrel on circumference 53 19 and extension screw mandrel 17 on circumference 51 long measure that can stagger as shown in Figure 11, perhaps stagger 1.5 times or 2 times of length unit's (not shown) are roughly uniform with the grid of the intersection section that guarantees this different length.
As shown in figure 12, from hanging screw mandrel 20, titanium-nickel wire is begun the braiding of first group of crest of the second wave band and trough around the position to extension screw mandrel 21, between circumference 56 and circumference 57, the titanium-nickel wire of the titanium-nickel wire of the second wave band and the first wave band has formed first cross point 22.Position in the first cross point 22, the second wave band titanium-nickel wire is on the first wave band titanium-nickel wire.Equally, between circumference 55 and circumference 56, the titanium-nickel wire of the titanium-nickel wire of the second wave band and the first wave band has formed second cross point 23, the position in the second cross point 23, and the titanium-nickel wire of the second wave band passes below the first wave band titanium-nickel wire.Continue to repeat this step, the titanium-nickel wire of the second wave band repeatedly intersects with the titanium-nickel wire of the first wave band again, and alternately strides across from the titanium-nickel wire above and below of the first wave band.According to above weaving method with titanium-nickel wire at last around the position to the extension screw mandrel 24 of circumference 51, finish the braiding of the second wave band.Figure 12 and Fig. 4 contrast, an important difference between two kinds of embodiments is: only have the cross point between the first wave band in Figure 12 and the second wave band and do not have crosslinking points, titanium-nickel wire herein is not wound around mutually, allows the relative appropriate slippage of the first wave band and the second wave band; And form fixedly crosslinking points between the first wave band in Fig. 4 and the second wave band, and be all mutually to be wound around in its junction, make the first wave band relative fixing more tightly with the second wave band.For the more intensive support of grid, the weaving manner in Figure 12 is easier, has better compliance.For the more sparse support of grid, the weaving manner in Fig. 4 is conducive to improve radial support power, reduces the cripetura rate.Complete the braiding of triband, the 4th wave band, the 5th wave band according to the first wave band, weaving method that the second wave band is identical, last titanium-nickel wire is around the position of the extension screw mandrel 25 that arrives circumference 58, first, second, third and fourth, five wave bands are interweaved into first group of grid, as shown in figure 13.
As shown in figure 14, the braiding of second group of grid of beginning.Begin the braiding of the 6th wave band from the position that hangs screw mandrel 25, position at the extension screw mandrel 26 of circumference 56, trough of the 6th wave band and a crest of the first wave band overlap to form a fixedly crosslinking points, and overlapping titanium-nickel wire is intertwined mutually in the position that hangs screw mandrel 26.According to above method, each trough of the 6th wave band forms a fixedly crosslinking points with the corresponding crest of the first wave band at the location overlap of a corresponding extension screw mandrel respectively, the titanium-nickel wire of overlapping is intertwined mutually, with the position of titanium-nickel wire around the extension screw mandrel 27 that arrives circumference 51, finish the braiding of the 6th wave band at last.The 6th wave band has similar shape to the 4th wave band, and both extend in parallel and keep certain distance, and still, the 6th wave band also forms respectively a plurality of cross points with triband and the 5th wave band.Therefore, a plurality of fixedly crosslinking points are arranged between the first wave band of the 6th wave band and first group of grid, can form more firmly and to connect, and and first group of grid between a plurality of cross points are arranged, even weave in.
As shown in figure 15, begin to complete the braiding of the 7th wave band from the position that hangs screw mandrel 27 according to above method, each trough of the 7th wave band is overlapped on a corresponding extension screw mandrel with the corresponding crest of the second wave band respectively, forms a fixedly crosslinking points at this.The 7th wave band forms a plurality of cross points with the 4th wave band and the 6th wave band respectively, and the 7th wave band more firmly is connected with the second wave band formation.Continue to complete the braiding of the 8th wave band, the 9th wave band, the tenth wave band, this moment the 6th, seven, eight, nine, ten wave bands be woven into second group of grid, each wave band also respectively with first group of grid weave in.At this moment, have ten wave band covers and be woven in together, make first group of grid and second group of grid mutually overlapping, form more uniform cross point.Wherein, a wave band of second group of grid is connected in couples with a wave band of first group of grid and forms a plurality of fixedly crosslinking points, for example, the 8th and triband, the 9th and the 4th wave band, the tenth and the 5th wave band.Each connection can be completed by an extension screw mandrel, herein, a trough on a wave band of second group of grid respectively with a wave band of first group of grid on a crest overlapping and form a fixedly crosslinking points and being intertwined, therefore second group of grid and first group of grid formation more firmly multiple spot be connected, can improve the radial support power of support and reduce axial cripetura rate.
The 3rd group of grid that then take up one's knitting, the 11 wave band as shown in figure 15, the braiding of the 12 wave band, last titanium-nickel wire is around the position to the extension screw mandrel 28 of circumference 51.Same, each trough of the 11 wave band is overlapped in the corresponding crest of the 6th wave band respectively and forms a fixedly crosslinking points on a corresponding extension screw mandrel, each trough of the 12 wave band is overlapped in the corresponding crest of the 7th wave band respectively and forms a fixedly crosslinking points on a corresponding extension screw mandrel, and the 11 wave band and the 12 wave band also form a lot of cross points with other wave band weave in of second group of grid respectively.A plurality of fixedly crosslinking points between the 11 wave band and the 6th wave band are fastened, and a plurality of fixedly crosslinking points between the 12 wave band and the 7th wave band are fastened, and make the 3rd group of grid form relatively firmly with second group of grid and are connected uniformly.
As shown in figure 16, continue the 3rd group of grid of braiding according to above method from the position that hangs screw mandrel 28, complete the braiding of the tenth triband, the 14 wave band, the 15 wave band and the 16 wave band.Begin from the position that hangs screw mandrel 17 titanium-nickel wire of the 16 wave band afterbody and the titanium-nickel wire braiding of the first wave band are fastened together, finish the braiding of whole support.At this moment, the 3rd group of grid is not only together with second group of grid overlaps on, also together with first group of grid overlaps on, for example, the 13 and the 8th wave band, the 14 and triband, the the 15 and the 4th wave band, the 16 and the 5th wave band, all being intertwined and connected in couples forms a plurality of fixedly crosslinking points.In fact, a wave band of first group of grid is connected with a plurality of fixedly crosslinking points that a wave band of a wave band of second group of grid and the 3rd group of grid has formed wound form respectively, and a wave band of second group of grid is connected with a plurality of fixedly crosslinking points that a wave band of a wave band of first group of grid and the 3rd group of grid has formed wound form respectively.Therefore, these three groups of grids evenly overlap on together mutually, consist of the integral grid of a closure, can also form evenly between these three groups of grids and more a plurality of fixedly crosslinking points connections, and the long-range steadiness of whole grid is better.Owing to also having some cross points that are not intertwined and connected between these three groups of grids, three groups of grids can slide mutually at these places, cross point, and whole grid table reveals short distance transmutability preferably, and namely compliance is better.
Embodiment three
Figure 17 is the schematic diagram after the die needed side surface of the intraluminal stent of making the present embodiment launches, difference between the mould of this mould and embodiment one is, this mould comprises two cylindrical sections that diameter is different, what diameter was less is roundlet shell of column 29, and diameter larger be great circle shell of column 31, two cylindrical sections connect by conical section 30, the whole mould that forms a syllogic.In order to make various difform intraluminal stents or support component, the profile of this mould can have multiple conversion, as: external diameter is done the multi-segment structure that stairstepping changes, and an end or two ends are bell-mouthed structure, continuous pyramidal structure.By the method that segmentation weaves, make intravascular stent or the support component of various respective shapes.
The present embodiment adopts the titanium-nickel wire braiding identical with embodiment one.As Figure 18 and shown in Figure 19, circumference 61,62,63,64 takes up one's knitting from the extension screw mandrel 32 of circumference 61, and according to the method identical with embodiment one, first completes the braiding of the bracket head section on roundlet shell of column 29 all on roundlet shell of column 29.As shown in figure 20, be conical section 30 between circumference 64 and circumference 65, circumference 65,66,67,68,69,70 passes a titanium-nickel wire, beginning braided support rear on conical section 30 and great circle shell of column 31 from the position of the extension screw mandrel 33 of circumference 64 all on great circle shell of column 31.For support rear and bracket head section being connected into a complete tubulose grid, when the titanium-nickel wire of support rear is walked around each on circumference 64 and is hung screw mandrel, simultaneously also will with the titanium-nickel wire snapping of the bracket head section of walking around this extension screw mandrel or hinged, snapping forms crosslinking points and being connected between the head section of support and rear is more loose, hingedly forms fixedly crosslinking points and support is more firm.The step-like intraluminal stent of completing at last as shown in figure 21, the diameter of bracket head section is less, the support rear comprises the conical section of a transition and larger one section of diameter.
Embodiment four
The present embodiment adopts the mould identical with embodiment one and titanium-nickel wire braiding.Complete the braiding of the first axial wave band according to the identical method of embodiment one, then begin the braiding of the second wave band.As shown in figure 22, in the position that hangs screw mandrel 34, the crest of the trough of the second wave band and the first wave band is overlapping, and both are intertwined mutually, form a fixedly crosslinking points.In the position that hangs screw mandrel 35, the trough of the second wave band forms a revocable crosslinking points together with the crest of the first wave band just hangs over mutually, and namely snapping, do not have winding mutually not hinged, and therefore, both can move by uniaxially mutually, but can not mutually break away from.According to mode as shown in figure 22, the junction point of two wave bands is snapping alternately and hinged mode, and namely fixedly crosslinking points and revocable crosslinking points are alternately distributed, and complete the braiding of the second wave band.According to completing the braiding of all the other wave bands with upper type, each hangs the corresponding crosslinking points of screw mandrel, on all junction points, snapping with hinged be the even distribution that replaces basically.That is to say, see in the axial direction, the junction point alternative arrangement of hinged junction point and snapping is seen at circumferencial direction, and hinged junction point and the junction point of snapping are also alternative arrangements, and the support of completing at last as shown in figure 23.The compliance of the intraluminal stent of making like this is better than pure hinged support, can also keep preferably axially cripetura rate and radial support power uniformly.
The self-inflated intraluminal stent of braiding of the prior art, it is generally the circumferential wave band of braiding, also adopt the closed loop grid, to improve radial support power, but the compliance of this kind intraluminal stent is good not, and axial strength is large not, shorten with regard to easily piling up when meeting obstructions, also be unfavorable for resiling; If increase fixedly crosslinking points on circumferential wave band, can make again the radial strength of intraluminal stent excessive, be difficult to be compressed in the sheath pipe, be unfavorable for release and the recovery of intraluminal stent.
The advantage of intraluminal stent of the present utility model has been to adopt axial wave band, keep the intrinsic advantage of the intraluminal stent of closed loop braiding, for example, can realize resetting, be that support can be regained the sheath pipe again after discharging a part, release is again carried out in adjusted position postpone; On the other hand, not only reduced the cripetura rate, when discharging, support is difficult for being shifted, registration is easily controlled, and compliance and axial strength have been improved, can bear larger angle of bend and not give a discount and also do not lose radial support power, therefore can implant various tortuous body lumen diseased regions.In preferred version of the present utility model, fixedly crosslinking points is distributed on circumference, guaranteed the radial support intensity of intraluminal stent, and crossover points distributed is conducive to improve the compliance of intraluminal stent at different intersection sections.Preferred version of the present utility model make and fixedly crosslinking points be distributed on the demarcation line of adjacent intersection section, the cross point and fixedly crosslinking points form alternating, complementary, and the cross point is more than fixing crosslinking points, increased mesh-density, therefore structural stability is better, can increase the covering power to the arteriosclerosis plate, allows the suitable distortion of tubulose grid, Uniform Dispersion stress and frictional force are taken into account cripetura rate, compliance and radial support intensity.
The self-inflated intraluminal stent of the diameter 4-12 millimeter that this utility model is realized, when diameter compressed 12%, its length only increases 12-18%.The self-inflated intraluminal stent of 8 mm dias of the present utility model is compressed in the sheath pipe of internal diameter 3 millimeter, and its length increases less than 40%, corresponding cripetura rate approximately 30%; And adopting the self-inflated intraluminal stent percentage elongation under equal conditions that common weaving method of the prior art is made to be about 100%, corresponding cripetura rate is about 50%.Therefore, with the contrast of the intraluminal stent of braiding of the prior art, the cripetura rate when intraluminal stent of the present utility model discharges from the sheath pipe significantly reduces, and is conducive to improve controllability and the positioning accuracy of its operation.
The above is only preferred embodiment of the present utility model; not in order to limit this utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (10)
1. the self-inflated intraluminal stent of a braiding, described intraluminal stent comprises the tubulose grid that is connected to form at circumferencial direction by a plurality of axial wave bands, described tubulose grid has axis, near-end and far-end, described each wave band alternately is comprised of a plurality of crests and a plurality of trough of elastic yarn in axially coiling, the near-end of each wave band and far-end connect respectively another wave band, there is respectively a wave band of adjacency side by side the both sides of each wave band, every two have at least one crosslinking points between the wave band of adjacency side by side, described each crosslinking points passes a corresponding crest on another wave band wherein by a trough on one of them wave band of two wave bands of described adjacency side by side and intersects and form, and at least a portion among described crosslinking points is fixing crosslinking points, it is characterized in that: each wave band also is overlapping with other at least one wave band, form a plurality of cross points between the described wave band that is overlapping, each wave band also consists of one group of parallel wave band with other at least one wave band, and described one group of parallel wave band has similar waveform and is parallel to each other trend and can not form crosslinking points or cross point between described parallel wave band.
2. the self-inflated intraluminal stent of a kind of braiding as claimed in claim 1, it is characterized in that: described tubulose grid comprises a plurality of intersection sections that connect vertically, described each intersection section is for tubulose and comprise roughly equally distributed a plurality of cross point, only on the demarcation line of adjacent two intersection sections, described demarcation line is closed loop to described crosslinking points.
3. the self-inflated intraluminal stent of a kind of braiding as claimed in claim 2, it is characterized in that: nk-1 crosslinking points arranged respectively on described each demarcation line, perhaps on described each demarcation line, nk+1 crosslinking points arranged respectively, wherein, n and k are natural numbers, n 〉=3 and k 〉=2.
4. the self-inflated intraluminal stent of a kind of braiding as claimed in claim 2, it is characterized in that: described each to intersect the number in the cross point on section be roughly the integral multiple of the number of the crosslinking points on described each demarcation line, described two number purpose ratios with the most close Galois extension value less than 0.2.
5. the self-inflated intraluminal stent of a kind of braiding as claimed in claim 2 is characterized in that: the crosslinking points on described demarcation line is all fixing crosslinking points.
6. the self-inflated intraluminal stent of a kind of braiding as claimed in claim 2 is characterized in that: described each zone of intersection segment length equates.
7. the self-inflated intraluminal stent of a kind of braiding as claimed in claim 2 is characterized in that: a described length of intersecting section is that described another intersects the integral multiple of length of section.
8. the self-inflated intraluminal stent of a kind of braiding as claimed in claim 1, it is characterized in that: the diameter of described tubulose grid changes vertically.
9. the self-inflated intraluminal stent of a kind of braiding as claimed in claim 1, it is characterized in that: described tubulose grid comprises different at least two sections of the diameter that links together vertically, each section of tubulose grid comprises a plurality of wave bands, between the wave band of the wherein wave band of a section of tubulose grid and another section of tubulose grid, crosslinking points is arranged.
10. the self-inflated intraluminal stent of a braiding, described intraluminal stent comprises the tubulose grid that is connected to form at circumferencial direction by a plurality of axial wave bands, described tubulose grid has axis, near-end and far-end, described each wave band alternately is comprised of a plurality of crests and a plurality of trough of elastic yarn in axially coiling, the near-end of each wave band and far-end connect respectively another wave band, there is respectively a wave band of adjacency side by side the both sides of each wave band, every two have at least one fixedly crosslinking points between the wave band of adjacency side by side, described each fixedly crosslinking points pass a corresponding crest on another wave band wherein by a trough on one of them wave band of two wave bands of described adjacency side by side and intersect and fixedly form, it is characterized in that: each wave band also is overlapping with other at least one wave band, form a plurality of cross points between the described wave band that is overlapping.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220586274 CN202982316U (en) | 2012-11-08 | 2012-11-08 | Self-expanding type knitted tube bracket |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220586274 CN202982316U (en) | 2012-11-08 | 2012-11-08 | Self-expanding type knitted tube bracket |
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| CN202982316U true CN202982316U (en) | 2013-06-12 |
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| CN 201220586274 Expired - Lifetime CN202982316U (en) | 2012-11-08 | 2012-11-08 | Self-expanding type knitted tube bracket |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102973341A (en) * | 2012-11-08 | 2013-03-20 | 先健科技(深圳)有限公司 | Braided self-expanding type tube cavity support and manufacturing method thereof |
| CN106176002A (en) * | 2014-11-26 | 2016-12-07 | Pentas股份有限公司 | Self-expansion type support |
-
2012
- 2012-11-08 CN CN 201220586274 patent/CN202982316U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102973341A (en) * | 2012-11-08 | 2013-03-20 | 先健科技(深圳)有限公司 | Braided self-expanding type tube cavity support and manufacturing method thereof |
| WO2014071837A1 (en) * | 2012-11-08 | 2014-05-15 | 先健科技(深圳)有限公司 | Braided self-expanding endoluminal stent and manufacturing method thereof |
| CN102973341B (en) * | 2012-11-08 | 2015-06-17 | 先健科技(深圳)有限公司 | Braided self-expanding type tube cavity support and manufacturing method thereof |
| CN106176002A (en) * | 2014-11-26 | 2016-12-07 | Pentas股份有限公司 | Self-expansion type support |
| CN106176002B (en) * | 2014-11-26 | 2018-12-21 | Pentas股份有限公司 | Self-expansion type bracket |
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